With Windows 7 having made its grand debut, and with KDE4's vision making leaps and bounds forward with every release, we have two major software projects that have decided to implement some fairly drastic interface changes. Such changes are bound to receive some harsh criticisms - but the funny thing is, these criticisms usually come from people you least expect it from.

EVERYONE and ANYONE dislikes learning or relearning an OS or app.
A geek that likes his tweaks, a noob that can't find his butt with both hands, or anything in between - most will gripe about change or things they don't know yet.